History of the Telephone

By dcordell20
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    Time span

  • Bell Labs

    Bell Labs
    source
    The first touch tone system which was used tones in the voice frequency range rather than pulses generated by rotary dials.This increased the speed of dailing for the telephone.

  • Bell Labs

    Bell Labs
    source
    The first mobile telephone call from a car occured. A driver pulled out a phone out of his dash board and made a call.

  • Bell Lab

    Bell Lab
    source
    The first commercial mobile phone was installed. It was istalled in St. Loius.

  • Att

    Att
    source
    Research into cell phone technology began with an examination of the limited mobile phones of the time. Scientists think by using small cells will increase the traffic of phone calls.

  • Bell Labs

    Bell Labs
    sourceCellular telephone service concieved by D.H. Ring at Bell Labs. This technology didn't actually exist.

  • Bell Labs

    Bell Labs
    sourceError detecting coding, first developed for telephone switching is now used throughout the computing and telecommunication industries. Bell Labs developed a general theory for error correcting theorys.

  • Att

    Att
    sourceThe wireless telephone service was available in almost 100 cities and highway corridors. This helps because this makes the phones buisness grow.

  • Bell Labs

    Bell Labs
    sourceAfter World War 2 the phone buisness had to hurry up because of the loss. In the rest of the year their was 30,000,000 phone services.